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arXiv 0912.3153hep-ph
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用可观测到的mu -> e-γ率来验证稀薄发生

Reconciling leptogenesis with observable mu --> e gamma rates

Steve Blanchet, Thomas Hambye, Francois-Xavier Josse-Michaux

摘要:

我们在近似守恒轻子数的跷跷板模型的框架下对热轻子生成进行了详细的分析。这些模型被称为允许大汤川耦合和一个低的跷跷板规模与中微子质量的限制,从而导致大轻子味违反率,可以通过实验探测。虽然大汤川耦合导致(逆)衰变率远大于哈勃膨胀率,我们表明,leptogenesis冲洗诱导一般是小的,如果右手中微子之间的质量分裂是足够小的。因此,大的轻子味违反率与成功的轻子生成是相容的。我们强调,这种情况不需要任何特定的风味结构。在这种情况下,一个小的分裂是自然的和辐射稳定的,因为它受到轻子数对称性的保护。

英文摘要:

We perform a detailed analysis of thermal leptogenesis in the framework of seesaw models which approximately conserve lepton number. These models are known to allow for large Yukawa couplings and a low seesaw scale in agreement with neutrino mass constraints, and hence to lead to large lepton flavour violating rates that can be probed experimentally. Although large Yukawa couplings lead to (inverse) decay rates much larger than the Hubble expansion rate, we show that the leptogenesis washout induced is generically small if the mass splitting between the right-handed neutrinos is small enough. As a result, large lepton flavour violating rates are compatible with successful leptogenesis. We emphasize that this scenario does not require any particular flavour structure. A small splitting is natural and radiatively stable in this context because it is protected by the lepton number symmetry.

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